Datasheet
LTC3883/LTC3883-1
68
3883fa
For more information www.linear.com/LTC3883
MFR_RESET
This command provides a means by which the user can perform a reset of the LTC3883.
This write-only command has no data bytes.
PWM CONFIGURATION
COMMAND NAME CMD CODE DESCRIPTION TYPE
DATA
FORMAT UNITS NVM
DEFAULT
VALUE
MFR_PWM_MODE_
LT C 3883
0xD4 Configuration for the PWM engine. R/W Byte Reg Y 0xD2
MFR_PWM_CONFIG_
LT C 3883
0xF5 Set numerous parameters for the DC/DC controller including
phasing.
R/W Byte Reg Y 0x10
FREQUENCY_SWITCH 0x33 Switching frequency of the controller. R/W Word L11 kHz Y 350
0xFABC
MFR_PWM_MODE_LTC3883
The MFR_PWM_MODE_LT C 3883 command allows the user to program the PWM controller to use Burst Mode operation,
discontinuous (pulse-skipping mode), or forced continuous conduction mode.
BIT MEANING
7
0b
1b
Use High Range of I
LIMIT
Low Current Range
High Current Range
6 Enable Servo Mode
[5:4]
00b
01b
10b
READ_IIN Gain Setting
2x Gain, 50mV Max Input
4x Gain, 20mV Max Input
8x, Gain, 8mV Max Input
3 Start DCR Auto Calibration
2 Reserved
Bit[1:0]
00b
01b
10b
Mode
Discontinuous
Burst Mode Operation
Forced Continuous
Whenever the channel is ramping on, the PWM mode will be discontinuous, regardless of the value of this
command.
Bit [7]
of this command determines if the part is in high range or low range of the IOUT_OC_FAULT_LIMIT command.
Changing this bit value changes the PWM loop gain and compensation. Changing this bit value whenever an output is
active may have detrimental system results.
Bit [6] The LTC3883 will not servo while the part is OFF, ramping on or ramping off. When set to a one, the output servo
is enabled. The output set point DAC will be slowly adjusted to minimize the difference between the READ_VOUT_ADC
and the VOUT_COMMAND (or the appropriate margined value).
Bit[5:4] set the READ_IIN gain and range setting of the input current sense amplifier.
PMBus
COMMAND DETAILS